纳米Fe_3O_4磁性粒子的制备及物性研究  

Preparation and Properties of Fe_3O_4 Magnetic Nano-particles

作　　者：李砯[1] 侯乙东[1] 李旦振[1] 张安 付贤智[1] 

机构地区：[1]福州大学光催化研究所,福建福州350002 [2]福建师大附中,福建福州350007

出　　处：《无机材料学报》2003年第4期929-932,共4页Journal of Inorganic Materials

基　　金：国家自然科学基金(20133010;20073007;20273014);福建省自然科学基金(A0010014;D002003);福建省教育厅重点项目(JA02138);福州大学科技发展基金(XKJ(QD)-0105)

摘　　要：利用滴定水解法制备了Fe_3O_4纳米颗粒,经XRD和漫反射吸收谱分析,Fe_3O_4晶粒粒径约为18nm,从紫外至近红外(200～3000nm)均有很强的光吸收。纳米Fe_3O_4有明显的负磁阻和湿敏效应,其阻抗随磁感应强度和湿度的增大而减小。The Fe3O4 magnetic nano-particles prepared by the titration hydrolyzation method were studied with X-ray diffration(XRD), UV-Vis diffusive reflectance spectrum(DRS), Magnetoresistance measurement and digital bridge LCR. The results show that the Pe(3)O(4) magnetic particles have strong absorptions in the rang from 250nm to 3000mn; the average diameter of the Fe3O4 nano-particles is about 18nm. The Fe3O4 granular film has obvious negative magnetoresistivity effect and humidity sensitive character. The impedance of the Fe3O4 nano-particles decreases with increasing magnetic induction and humidity respectively.

关 键 词：滴定水解法 磁阻 纳米颗粒 湿敏特性 

分 类 号：O611[理学—无机化学] TB383[理学—化学]